Add things to airdrop / any idea for what I can maek

Simple question.
Does anyone know how I can add new things into a care package?
I took it step by step from the Custom killstreak mod, but when I removed set killstreaks to none, none, none, it gave a bad syntax, and I had no idea why.. so yeah, halp pl0x?
--------------------------------------------
I really got no ideas, anyone got some suggestions for what I can make?
Made a crappy Grim Reaper now, AT4 that shoots four times, reload, four times then back to your old weapon. An AC130 105mm follows the rocket, if you shoot at range its visible, but if you shoot close its barely visible, so it looks like the AT4 rocket explodes like an AC130 105mm.. quite cool.
Working on a Minigun, might give it up, not sure what to do with it..

(Things like 'killstreaks' would be awezum, new ones or editing the real ones)